Apparatus applicable to the receivers of telephones



F. S. LAMADRID.

APPARATUS APPUCAQLE TO THE RECEIVERS 0F TELEPHONES.

[\PPLICATION FILED MAY 23, I919. RENEWED FEB- 10,1922- Patented June 6, 1922.

Mom egg UNITED STATES PATENT OFFICE.

FEDERICO SANTOS LAMADRID, OF MADRID, SPAIN.

Application filed May 23, 1919, Serial No. 299,372.

To all whom it may concern Be it known that I, Fnnniuoo SANTos LA- MADRID, a subject of the King of Spain, residing at Madrid, in the Province of Madrid, Spain, have invented certain new and useful Improvements in an Apparatus Applicable to the Receivers of Telephones; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this specification.

This invention relates to an auxiliary telephone receiver adapted to be connected to the usual receiver for protecting the sound waves from the receiver against nullifying or interrupting interference.

The invention includes a hollow, appropriately shaped body adapted to be removably connected to the ordinary telephone re ceiver, and having a perforated ear piece provided with a vibration dampening member, a spring being arranged within said body to vibrate in accordance with the diaphragm of the receiver, to thereby intensify and direct such vibrations to the body.

In the drawings:

Fig. 1 is a perspective view of the improved auxiliary receiver.

Fig. 2 is a vertical central section of the same.

As here illustrated, the improved auxiliary receiver comprises a body a, preferably metallic and of inverted cone shape. The outer end of the body is provided with a disk 7) having a centrally depressed portion formed with a series of perforations c, the edge of the disk being also formed with perforations d. Between the perforations c and d, the disk is, or may be, slightly recessed to receive an annular strip of suitable material serving to dampen possible vibrations of said disk I).

The inner end of the body is formed as a cylindrical portion h, and the body is further provided at the end of such cylindrical portion with an annular disk 9 having an edge flange to engage the appropriately shaped portion of the usual telephone receiver. It is understood that such disk 9 is merely the means for connecting the auxiliary receiver to the usual receiver,

Specification of Letters Patent.

Renewed February 10, 1922. Serial No. 535,613.

and that such disk is to be constructed so that it may be readily applied and temporarily secured to such ordinary receiver at will. Within the cylindrical portion it of the body a is secured helical spring i, which spring is to be so constructed as to be sensibly vibrated by the sound waves induced by the vibration of the diaphragm, such spring serving by such vibration to intensify the sound waves from the diaphragm, and protect the same against interference from other possible sound waves, which would be in effect suppressed by the failure of the spring to vibrate under such sound waves.

The vibration dampening material 7 serves to prevent independent vibration of the disk 6, and hence the sound waves of the diaphragm amplified by the particular conical form of the body, which thus c0nstitutes a sound chamber, and protected against interference by the co-existing vibration of the spring 71 are delivered through the perforations c and (Z in a particularly clear and exact manner. Furthermore, the material 7 provides for theready application of antiseptic material as ordinarily employed.

Having thus described the invention, what is claimed as new is:

1. An auxiliary telephone receiver, including a body, a disk closure for one end of the body having spaced annular rows of perforations, and a vibration damping strip secured to the disk between the rows of perforation.

2. An auxiliary telephone receiver, ineluding a hollow substantially conical body, a disk arranged to close the larger end of said body and formed with inner and outer rows of perforations, and a vibration damping strip secured to the disk between said rows of perforation.

3. An auxiliary telephone receiver, including a conical body, vibration damping means arranged at the larger end of the body and a vibration absorbing spring arranged at the smaller end of the body.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

FEDERICO SANTOS LAMADRID.

Witnesses:

Josii FERRER Y Tonnes, ALFONSO Lornz.

Patented. June 6,1922. 

